EP 1197476 A3 20020522 - Mother glass composition for graded index lens
Title (en)
Mother glass composition for graded index lens
Title (de)
Mutterglaszusammensetzung für eine Indexgradientenlinse
Title (fr)
Composition de verre-mère pour lentille à gradient d'indice
Publication
Application
Priority
JP 2000310654 A 20001011
Abstract (en)
[origin: EP1197476A2] A compositional range for a mother glass composition for graded index lenses which has a desired refractive index and is less apt to be devitrified and to develop cracks upon ion exchange was obtained by incorporating at least a given amount of one or more ingredients which are selected from oxides of metal elements ranging from yttrium, atomic number 39, to tantalum, atomic number 73, and which are less apt to cause glass coloration into a glass based on SiO2-TiO2-Li2O-Na2O and containing no lead oxide. In particular, a compositional range in which a large angular aperture is obtained and devitrification is less apt to occur was obtained by incorporating Ta2O5 and ZrO2 in a specific proportion and in specific amounts.
IPC 1-7
C03C 3/085; C03C 3/095; C03C 3/097; C03C 3/062; C03C 3/076; C03C 3/078; G02B 3/00
IPC 8 full level
G02B 6/00 (2006.01); C03C 3/062 (2006.01); C03C 3/078 (2006.01); C03C 3/085 (2006.01); C03C 3/089 (2006.01); C03C 3/091 (2006.01); C03C 3/093 (2006.01); C03C 3/095 (2006.01); C03C 3/097 (2006.01); G02B 1/00 (2006.01); G02B 3/00 (2006.01); G02B 6/028 (2006.01)
CPC (source: EP US)
C03C 3/062 (2013.01 - EP US); C03C 3/078 (2013.01 - EP US); C03C 3/097 (2013.01 - EP US); G02B 3/0087 (2013.01 - EP US); Y10S 501/90 (2013.01 - EP US)
Citation (search report)
- [XY] EP 0287345 A1 19881019 - CANON KK [JP]
- [Y] EP 0918235 A2 19990526 - NIPPON SHEET GLASS CO LTD [JP]
- [XY] PATENT ABSTRACTS OF JAPAN vol. 012, no. 446 (C - 546) 24 November 1988 (1988-11-24)
- [XY] PATENT ABSTRACTS OF JAPAN vol. 013, no. 115 (C - 578) 20 March 1989 (1989-03-20)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
EP 1197476 A2 20020417; EP 1197476 A3 20020522; CN 1200900 C 20050511; CN 1346809 A 20020501; JP 2002121048 A 20020423; TW I252219 B 20060401; US 2002065186 A1 20020530; US 6764972 B2 20040720
DOCDB simple family (application)
EP 01123387 A 20011011; CN 01136342 A 20011010; JP 2000310654 A 20001011; TW 90125065 A 20011011; US 97381601 A 20011011